2 ******************************************************************************
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3 * @file stm32f7xx_hal_crc_ex.c
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4 * @author MCD Application Team
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6 * @date 06-March-2015
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7 * @brief Extended CRC HAL module driver.
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9 * This file provides firmware functions to manage the following
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10 * functionalities of the CRC peripheral:
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11 * + Initialization/de-initialization functions
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14 ==============================================================================
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15 ##### CRC specific features #####
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16 ==============================================================================
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18 (#) Polynomial configuration.
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19 (#) Input data reverse mode.
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20 (#) Output data reverse mode.
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23 ******************************************************************************
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26 * <h2><center>© COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
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28 * Redistribution and use in source and binary forms, with or without modification,
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29 * are permitted provided that the following conditions are met:
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30 * 1. Redistributions of source code must retain the above copyright notice,
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31 * this list of conditions and the following disclaimer.
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32 * 2. Redistributions in binary form must reproduce the above copyright notice,
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33 * this list of conditions and the following disclaimer in the documentation
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34 * and/or other materials provided with the distribution.
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35 * 3. Neither the name of STMicroelectronics nor the names of its contributors
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36 * may be used to endorse or promote products derived from this software
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37 * without specific prior written permission.
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39 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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40 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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42 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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43 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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44 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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45 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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46 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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47 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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48 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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50 ******************************************************************************
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53 /* Includes ------------------------------------------------------------------*/
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54 #include "stm32f7xx_hal.h"
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56 /** @addtogroup STM32F7xx_HAL_Driver
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60 /** @addtogroup CRCEx
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61 * @brief CRC Extended HAL module driver
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65 #ifdef HAL_CRC_MODULE_ENABLED
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67 /* Private typedef -----------------------------------------------------------*/
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68 /* Private define ------------------------------------------------------------*/
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69 /* Private macro -------------------------------------------------------------*/
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70 /* Private variables ---------------------------------------------------------*/
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71 /* Private function prototypes -----------------------------------------------*/
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72 /* Private functions ---------------------------------------------------------*/
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74 /** @addtogroup CRCEx_Exported_Functions
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78 /** @addtogroup CRCEx_Exported_Functions_Group1
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79 * @brief Extended CRC features functions
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82 ===============================================================================
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83 ##### CRC Extended features functions #####
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84 ===============================================================================
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86 This subsection provides function allowing to:
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87 (+) Set CRC polynomial if different from default one.
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95 * @brief Initializes the CRC polynomial if different from default one.
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96 * @param hcrc: CRC handle
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97 * @param Pol: CRC generating polynomial (7, 8, 16 or 32-bit long)
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98 * This parameter is written in normal representation, e.g.
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99 * for a polynomial of degree 7, X^7 + X^6 + X^5 + X^2 + 1 is written 0x65
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100 * for a polynomial of degree 16, X^16 + X^12 + X^5 + 1 is written 0x1021
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101 * @param PolyLength: CRC polynomial length
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102 * This parameter can be one of the following values:
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103 * @arg CRC_POLYLENGTH_7B: 7-bit long CRC (generating polynomial of degree 7)
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104 * @arg CRC_POLYLENGTH_8B: 8-bit long CRC (generating polynomial of degree 8)
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105 * @arg CRC_POLYLENGTH_16B: 16-bit long CRC (generating polynomial of degree 16)
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106 * @arg CRC_POLYLENGTH_32B: 32-bit long CRC (generating polynomial of degree 32)
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107 * @retval HAL status
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109 HAL_StatusTypeDef HAL_CRCEx_Polynomial_Set(CRC_HandleTypeDef *hcrc, uint32_t Pol, uint32_t PolyLength)
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111 uint32_t msb = 31; /* polynomial degree is 32 at most, so msb is initialized to max value */
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113 /* Check the parameters */
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114 assert_param(IS_CRC_POL_LENGTH(PolyLength));
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116 /* check polynomial definition vs polynomial size:
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117 * polynomial length must be aligned with polynomial
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118 * definition. HAL_ERROR is reported if Pol degree is
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119 * larger than that indicated by PolyLength.
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120 * Look for MSB position: msb will contain the degree of
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121 * the second to the largest polynomial member. E.g., for
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122 * X^7 + X^6 + X^5 + X^2 + 1, msb = 6. */
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123 while (((Pol & ((uint32_t)(0x1) << msb)) == 0) && (msb-- > 0))
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127 switch (PolyLength)
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129 case CRC_POLYLENGTH_7B:
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130 if (msb >= HAL_CRC_LENGTH_7B)
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135 case CRC_POLYLENGTH_8B:
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136 if (msb >= HAL_CRC_LENGTH_8B)
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141 case CRC_POLYLENGTH_16B:
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142 if (msb >= HAL_CRC_LENGTH_16B)
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147 case CRC_POLYLENGTH_32B:
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148 /* no polynomial definition vs. polynomial length issue possible */
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154 /* set generating polynomial */
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155 WRITE_REG(hcrc->Instance->POL, Pol);
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157 /* set generating polynomial size */
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158 MODIFY_REG(hcrc->Instance->CR, CRC_CR_POLYSIZE, PolyLength);
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160 /* Return function status */
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165 * @brief Set the Reverse Input data mode.
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166 * @param hcrc: CRC handle
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167 * @param InputReverseMode: Input Data inversion mode
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168 * This parameter can be one of the following values:
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169 * @arg CRC_INPUTDATA_INVERSION_NONE: no change in bit order (default value)
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170 * @arg CRC_INPUTDATA_INVERSION_BYTE: Byte-wise bit reversal
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171 * @arg CRC_INPUTDATA_INVERSION_HALFWORD: HalfWord-wise bit reversal
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172 * @arg CRC_INPUTDATA_INVERSION_WORD: Word-wise bit reversal
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173 * @retval HAL status
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175 HAL_StatusTypeDef HAL_CRCEx_Input_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t InputReverseMode)
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177 /* Check the parameters */
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178 assert_param(IS_CRC_INPUTDATA_INVERSION_MODE(InputReverseMode));
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180 /* Change CRC peripheral state */
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181 hcrc->State = HAL_CRC_STATE_BUSY;
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183 /* set input data inversion mode */
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184 MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_IN, InputReverseMode);
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185 /* Change CRC peripheral state */
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186 hcrc->State = HAL_CRC_STATE_READY;
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188 /* Return function status */
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193 * @brief Set the Reverse Output data mode.
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194 * @param hcrc: CRC handle
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195 * @param OutputReverseMode: Output Data inversion mode
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196 * This parameter can be one of the following values:
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197 * @arg CRC_OUTPUTDATA_INVERSION_DISABLE: no CRC inversion (default value)
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198 * @arg CRC_OUTPUTDATA_INVERSION_ENABLE: bit-level inversion (e.g for a 8-bit CRC: 0xB5 becomes 0xAD)
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199 * @retval HAL status
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201 HAL_StatusTypeDef HAL_CRCEx_Output_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_t OutputReverseMode)
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203 /* Check the parameters */
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204 assert_param(IS_CRC_OUTPUTDATA_INVERSION_MODE(OutputReverseMode));
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206 /* Change CRC peripheral state */
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207 hcrc->State = HAL_CRC_STATE_BUSY;
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209 /* set output data inversion mode */
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210 MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_OUT, OutputReverseMode);
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212 /* Change CRC peripheral state */
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213 hcrc->State = HAL_CRC_STATE_READY;
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215 /* Return function status */
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232 #endif /* HAL_CRC_MODULE_ENABLED */
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241 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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